Parallel Batteries – A group of batteries or cells with all terminals of the same polarity wired together – i.e. positive connected to positive and negative connected to negative. In this set up the batteries capacity (amp hours or milliamp hours) is increased, but the voltage remains the same as the individual batteries. The capacity is calculated by adding together the individual capacities of the batteries being used.
While it is possible to connect batteries of different voltage and capacities together in parallel it is not recommended as it shortens the life of the batteries. For a full explanation see Connecting batteries in parallel.
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